The Galinsoga Ruiz & Pavón genus

Remark The words or terms in red (actually dark orange) in the text are defined in a glossary.

july_30_17.gthmb can't be loaded. The Galinsoga are annual plants with erect stems; their leaves are cauline, opposite and petiolate, the blades being 3 nerved. The small flower heads are pedunculate, hemispherical to campanulate and in loose terminal cymes. They essentially have disc florets and few sparse white ray florets, at times, none. The fruit is an achene.

There are about 30 species in the genus, of which two are found in North America, where it is an introduced adventive species; one of the two species has 3 varieties; of these 4 taxa, two are found in Québec :

The main differences between these two taxa are that the phyllaries of Galinsoga parviflora are persistent, those of Galinsoga quadriradiata are falling. At the cell level, Galinsoga parviflora is a diploid (2n = 16) and Galinsoga ciliata is a segmental allotetraploid (2n = 32).

The genus belongs to the Asteraceae family.


The genus has been named after Mariano Martínez de Galinsoga, 1766-1797, who was court physician and director of the Botanic Garden in Madrid. The vernacular names for the species found in Québec are Few Flowered Galinsoga for the parviflora species and Four Pointed Galinsoga or Shaggy Soldier for the quadriradiata species.